坞式船闸闸首结构应力变形三维有限元分析

发布时间：2018-07-13 08:04

【摘要】：由于坞式结构(又称为U型结构)具有整体性好、防渗性强、对地基承载力要求较低等优点,越来越多的建于软土地基和复杂地基上的船闸采用这种结构。船闸的闸首作为船闸工程的主要组成部分,闸首工程结构计算的正确性对保证船闸设计的合理性起着决定性的作用,而现如今在闸首的设计方面主要还是将空间问题简化为平面问题进行计算,为了能反映船闸三维结构的受力特点,本文依托颍上复线船闸,借助ANSYS分析软件采用解析法及三维非线性法对船闸闸首应力及变形特征进行计算分析,并采用单因素分析法探讨回填土参数及回填土表面荷载对结构内力的影响,得到以下结论：(1)通过对解析法计算结果和有限元法计算结果进行对比分析,得到两种方法的计算结果比较接近,说明三维数值模型能够较真实反映闸首复杂荷载和使用条件,验证了模型的正确性和实用性以及计算结果的准确性。(2)通过不同工况下对结构应力和位移的分析,可以得到闸门上的水压力是引起闸首结构在顺河向产生位移的主要原因;闸首底板表面在三种工况下都产生了不同程度的拉应力,在闸首边墩与底板接触部位以及边墩与闸门接触部位出现不同程度的应力集中；在三种工况下,由于有回填土压力的作用,左侧边墩变形和应力大于右侧边墩,竖直方向闸首结构主要受到压应力。(3)通过对影响结构受力的因素进行分析,结果表明：土体强度越高结构本身的应力、接触应力、沉降位移、水平位移及摩擦滑移越小,反之就越大,但土体内摩擦角变化的影响较粘聚力对结构受力和位移影响更敏感；回填土表面均布荷载对结构物的受力和位移影响较大,是结构受力影响的关键因素。
[Abstract]:Due to the advantages of docking structure (also called U-shaped structure), such as good integrity, strong impermeability and low requirement for foundation bearing capacity, more and more locks built on soft soil foundation and complex foundation adopt this kind of structure. As the main component of lock engineering, the correctness of structural calculation of lock head plays a decisive role in ensuring the rationality of lock design. At present, in the design of the gate head, the space problem is mainly simplified to a plane problem to be calculated. In order to reflect the stress characteristics of the three-dimensional structure of the lock, this paper relies on the Yingshang double line lock. The stress and deformation characteristics of shiplock head are calculated and analyzed by means of analytical method and three-dimensional nonlinear method with ANSYS analysis software, and the influence of backfill parameters and backfill surface load on structural internal force is discussed by single factor analysis method. The main conclusions are as follows: (1) by comparing and analyzing the results of the analytical method and the finite element method, the results of the two methods are close to each other, which shows that the three-dimensional numerical model can reflect the complex load and the operating conditions of the sluice head more truthfully. The correctness and practicability of the model and the accuracy of the calculation results are verified. (2) through the analysis of the stress and displacement of the structure under different working conditions, it can be concluded that the water pressure on the gate is the main cause of the displacement of the head structure along the river; The surface of the bottom plate of the sluice head produces different degrees of tensile stress under three working conditions, and the stress concentration is different in the contact part between the side pier and the bottom plate and the contact part between the side pier and the gate, and in the three conditions, Because of the backfill earth pressure, the deformation and stress of the left side pier is larger than that of the right side pier, and the vertical sluice head structure is mainly subjected to compressive stress. (3) through the analysis of the factors that affect the force of the structure, The results show that the higher the strength of soil, the smaller the stress, contact stress, settlement displacement, horizontal displacement and friction slip of the structure itself, but the more sensitive is the influence of the change of the internal friction angle of the soil than the cohesive force on the stress and displacement of the structure. The load distribution on the backfill surface has a great influence on the stress and displacement of the structure, which is the key factor of the influence of the structure.
【学位授予单位】：合肥工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U641

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